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Red Hat Enterprise Linux 7 GCC Optimizations – partial inlining indepth

Red Hat Enterprise Linux 7 GCC Optimizations – partial inlining indepth

In this prior post we mentioned several new optimization improvements in GCC for Red Hat Enterprise Linux 7. It’s time to dig a little deeper. In this post we will focus on partial inlining/function outlining which are part of the Inter-Procedural Analysis (IPA) framework.

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Function inlining is a well known technique to improve application performance by expanding the body of a called function into one or more of its call site(s). Function inlining decreases function call overhead, may improve icache behaviour, expose previously hidden redundancies, etc. However, the increase in total code size may be detrimental and, as a result, heuristics which drive inlining are very sensitive to code growth. Function outlining/partial inlining are variants of function inlining to allow for inlining with less code growth.

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